require 'rmagick'

imgl = Magick::ImageList.new
imgl.new_image(615, 100)

gc = Magick::Draw.new
gc.stroke('black').stroke_width(30)

# Draw thick line with "butt" linecap
gc.stroke_linecap('butt')
gc.line(25, 50, 175, 50)

# Draw thick line with "round" linecap
gc.stroke_linecap('round')
gc.line(225, 50, 375, 50)

# Draw thick line with "square" linecap
gc.stroke_linecap('square')
gc.line(425, 50, 575, 50)

# Show line endpoints in pink
gc.fill('lightpink')
gc.stroke('lightpink').stroke_width(3)
gc.line(25, 50, 175, 50)
gc.circle(25, 50, 27, 52).circle(175, 50, 177, 52)
gc.line(225, 50, 375, 50)
gc.circle(225, 50, 227, 52).circle(375, 50, 377, 52)
gc.line(425, 50, 575, 50)
gc.circle(425, 50, 427, 52).circle(575, 50, 577, 52)

# Annotate
gc.fill('black')
gc.fill_opacity(1)
gc.stroke('transparent')
gc.pointsize(14)
gc.font_weight(Magick::BoldWeight)

gc.text(55, 90, "\"'butt' cap\"")
gc.text(250, 90, "\"'round' cap\"")
gc.text(450, 90, "\"'square' cap\"")

gc.draw(imgl)

imgl.write('stroke_linecap.gif')
